In ISO 6507-3 it is required that the quadrilateral base of Vickers indenter has angles of 90° ± 0.2°. Squareness angles are usually evaluated through optical techniques by measuring the angles between two consecutive faces, which correspond to the quadrilateral base angles when the axis of the pyramid is perfectly parallel to the indenter-holder axis. However, if the pyramid axis is tilted by an angle within 0.3°, as allowed by the standard, these angles no longer correspond. This work deals with the description of a numerical method, based on a proper geometrical model, to correct squareness measurements. The proposed method is applied to experimental tests and measurement results, with related uncertainties, are presented. It is shown that the accuracy is improved. This method is easily implementable on different measuring systems and can be internationally adopted to improve the relevant standard.
A correction method for Vickers indenters squareness measurement due to the tilt of the pyramid axis / Prato, A.; Galliani, D.; Origlia, C.; Germak, A.. - In: MEASUREMENT. - ISSN 0263-2241. - 140:(2019), pp. 565-571. [10.1016/j.measurement.2019.04.007]
A correction method for Vickers indenters squareness measurement due to the tilt of the pyramid axis
Prato A.;Germak A.
2019
Abstract
In ISO 6507-3 it is required that the quadrilateral base of Vickers indenter has angles of 90° ± 0.2°. Squareness angles are usually evaluated through optical techniques by measuring the angles between two consecutive faces, which correspond to the quadrilateral base angles when the axis of the pyramid is perfectly parallel to the indenter-holder axis. However, if the pyramid axis is tilted by an angle within 0.3°, as allowed by the standard, these angles no longer correspond. This work deals with the description of a numerical method, based on a proper geometrical model, to correct squareness measurements. The proposed method is applied to experimental tests and measurement results, with related uncertainties, are presented. It is shown that the accuracy is improved. This method is easily implementable on different measuring systems and can be internationally adopted to improve the relevant standard.File | Dimensione | Formato | |
---|---|---|---|
1-s2.0-S026322411930291X-main.pdf
non disponibili
Tipologia:
2a Post-print versione editoriale / Version of Record
Licenza:
Non Pubblico - Accesso privato/ristretto
Dimensione
2.17 MB
Formato
Adobe PDF
|
2.17 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11583/2961786